java 将 int 颜色转换为 int 组件
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convert int color to int components
提问by Kamil
I obtain pixel color by
我通过以下方式获得像素颜色
int color = image.getRGB(x,y);
then i want to acquire red, green, blue components separately. How to do that? Maybe using some bitmask?
然后我想分别获取红色，绿色，蓝色组件。怎么做？也许使用一些位掩码？
int green = color&0x00ff00;
apparently not working... :(
显然不起作用... :(
回答by Alex Kucherenko
To get color components you can use:
要获取颜色组件，您可以使用：
import android.graphics.Color;
int r = Color.red(intColor);
int g = Color.green(intColor);
int b = Color.blue(intColor);
int a = Color.alpha(intColor);
回答by zezba9000
int value = image.getRGB(x,y);
R = (byte)(value & 0x000000FF);
G = (byte)((value & 0x0000FF00) >> 8);
B = (byte)((value & 0x00FF0000) >> 16);
A = (byte)((value & 0xFF000000) >> 24);
May need to flip the R, A, or B around.
可能需要翻转 R、A 或 B。
回答by codymanix
You forgot to shift the byte to the right:
您忘记将字节向右移动：
int green = (color & 0x00ff00) >> 8;
回答by khachik
You can use Colorconstructorand pass the given integer and hasalpha=true:
您可以使用Color构造函数并传递给定的整数和hasalpha=true：
Color color = new Color(image.getRGB(x,y), true);
getRGBreturns the color of type TYPE_INT_ARGBwhich means it has an alpha channel.
getRGB返回TYPE_INT_ARGB类型的颜色，这意味着它有一个 alpha 通道。
